6 files changed, 830 insertions, 0 deletions
diff --git a/nuttx/configs/teensy/src/Makefile b/nuttx/configs/teensy/src/Makefile
new file mode 100755
index 000000000..e27f02663
--- /dev/null
+++ b/nuttx/configs/teensy/src/Makefile
@@ -0,0 +1,103 @@
+############################################################################
+# configs/teensy/src/Makefile
+#
+#   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+-include $(TOPDIR)/Make.defs
+
+ASRCS		= 
+CSRCS		= up_boot.c
+
+ifeq ($(CONFIG_ARCH_LEDS),y)
+CSRCS		+= up_leds.c
+endif
+ifeq ($(CONFIG_USBSTRG),y)
+CSRCS		+= up_usbstrg.c
+endif
+ifeq ($(CONFIG_AVR_SPI),y)
+CSRCS		+= up_spi.c
+endif
+
+AOBJS		= $(ASRCS:.S=$(OBJEXT))
+COBJS		= $(CSRCS:.c=$(OBJEXT))
+
+SRCS		= $(ASRCS) $(CSRCS)
+OBJS		= $(AOBJS) $(COBJS)
+
+ARCH_SRCDIR	= $(TOPDIR)/arch/$(CONFIG_ARCH)/src
+ifeq ($(CONFIG_ARCH_AVR32),y)
+ARCH_SUBDIR	= avr32
+endif
+ifeq ($(CONFIG_ARCH_AVR),y)
+ARCH_SUBDIR	= avr
+endif
+
+ifeq ($(WINTOOL),y)
+  CFLAGS	+= -I "${shell cygpath -w $(TOPDIR)/sched}"
+  CFLAGS	+= -I "${shell cygpath -w $(ARCH_SRCDIR)/chip}" 
+  CFLAGS	+= -I "${shell cygpath -w $(ARCH_SRCDIR)/common}" 
+  CFLAGS	+= -I "${shell cygpath -w $(ARCH_SRCDIR)/$(ARCH_SUBDIR)}"
+else
+  CFLAGS	+= -I "$(TOPDIR)/sched"
+  CFLAGS	+= -I "$(ARCH_SRCDIR)/chip"
+  CFLAGS	+= -I "$(ARCH_SRCDIR)/common" 
+  CFLAGS	+= -I "$(ARCH_SRCDIR)/$(ARCH_SUBDIR)"
+endif
+
+all: libboard$(LIBEXT)
+
+$(AOBJS): %$(OBJEXT): %.S
+	$(call ASSEMBLE, $<, $@)
+
+$(COBJS) $(LINKOBJS): %$(OBJEXT): %.c
+	$(call COMPILE, $<, $@)
+
+libboard$(LIBEXT): $(OBJS)
+	@( for obj in $(OBJS) ; do \
+		$(call ARCHIVE, $@, $${obj}); \
+	done ; )
+
+.depend: Makefile $(SRCS)
+	@$(MKDEP) $(CC) -- $(CFLAGS) -- $(SRCS) >Make.dep
+	@touch $@
+
+depend: .depend
+
+clean:
+	@rm -f libboard$(LIBEXT) *~ .*.swp
+	$(call CLEAN)
+
+distclean: clean
+	@rm -f Make.dep .depend
+
+-include Make.dep
diff --git a/nuttx/configs/teensy/src/teensy_internal.h b/nuttx/configs/teensy/src/teensy_internal.h
new file mode 100755
index 000000000..c593c49ce
--- /dev/null
+++ b/nuttx/configs/teensy/src/teensy_internal.h
@@ -0,0 +1,101 @@
+/****************************************************************************
+ * configs/teensy/src/pcblogic-internal.h
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __CONFIGS_TEENSY_SRC_TEENSY_INTERNAL_H
+#define __CONFIGS_TEENSY_SRC_TEENSY_INTERNAL_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+/* Configuration ************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/****************************************************************************
+ * Inline Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/************************************************************************************
+ * Name: at90usb_spiinitialize
+ *
+ * Description:
+ *   Called to configure SPI chip select GPIO pins for the Teensy++ 2.0 board.
+ *
+ ************************************************************************************/
+
+#ifdef CONFIG_AVR_SPI
+EXTERN void weak_function at90usb_spiinitialize(void);
+#endif
+
+/************************************************************************************
+ * Name: at90usb_ledinit
+ *
+ * Description:
+ *   Configure on-board LEDs if LED support has been selected.
+ *
+ ************************************************************************************/
+
+#ifdef CONFIG_ARCH_LEDS
+EXTERN void at90usb_ledinit(void);
+#endif
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* __CONFIGS_TEENSY_SRC_TEENSY_INTERNAL_H */
diff --git a/nuttx/configs/teensy/src/up_boot.c b/nuttx/configs/teensy/src/up_boot.c
new file mode 100755
index 000000000..ad054c702
--- /dev/null
+++ b/nuttx/configs/teensy/src/up_boot.c
@@ -0,0 +1,93 @@
+/************************************************************************************
+ * configs/teensy/src/up_boot.c
+ * arch/mips/src/board/up_boot.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <debug.h>
+
+#include <arch/board/board.h>
+
+#include "up_arch.h"
+#include "up_internal.h"
+
+#include "at90usb_internal.h"
+#include "teensy_internal.h"
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: up_boardinitialize
+ *
+ * Description:
+ *   All AT90USB architectures must provide the following entry point.  This entry
+ *   point is called early in the intitialization -- after all memory has been
+ *   configured and mapped but before any devices have been initialized.
+ *
+ ************************************************************************************/
+
+void up_boardinitialize(void)
+{
+  /* Configure SSP chip selects if 1) at least one SSP is enabled, and 2) the weak
+   * function at90usb_spiinitialize() has been brought into the link.
+   */
+
+#ifdef CONFIG_AVR_SPI
+  if (at90usb_spiinitialize)
+    {
+      at90usb_spiinitialize();
+    }
+#endif
+
+  /* Configure on-board LEDs if LED support has been selected. */
+
+#ifdef CONFIG_ARCH_LEDS
+  at90usb_ledinit();
+#endif
+}
diff --git a/nuttx/configs/teensy/src/up_leds.c b/nuttx/configs/teensy/src/up_leds.c
new file mode 100755
index 000000000..7aabae5c3
--- /dev/null
+++ b/nuttx/configs/teensy/src/up_leds.c
@@ -0,0 +1,194 @@
+/****************************************************************************
+ * configs/teensy/src/up_leds.c
+ * arch/arm/src/board/up_leds.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+#include <debug.h>
+#include <avr/io.h>
+
+#include "up_arch.h"
+#include "up_internal.h"
+
+#include "at90usb_internal.h"
+#include "teensy_internal.h"
+
+#ifdef CONFIG_ARCH_LEDS
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* Enables debug output from this file (needs CONFIG_DEBUG with
+ * CONFIG_DEBUG_VERBOSE too)
+ */
+
+#undef LED_DEBUG   /* Define to enable debug */
+#undef LED_VERBOSE /* Define to enable verbose debug */
+
+#ifdef LED_DEBUG
+#  define leddbg  lldbg
+#  ifdef LED_VERBOSE
+#    define ledvdbg lldbg
+#  else
+#    define ledvdbg(x...)
+#  endif
+#else
+#  undef LED_VERBOSE
+#  define leddbg(x...)
+#  define ledvdbg(x...)
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static bool g_ncoff;
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: at90usb_ledinit
+ ****************************************************************************/
+
+void at90usb_ledinit(void)
+{
+  /* The Teensy's single LED is on Port D, Pin 6.  Configur this pin as an
+   * output and turn it OFF.  The "other" side of the LED is onnected to
+   * ground through a resistor.  Therefore, a logic value of 0 should turn
+   * the LED off.
+   */
+
+  DDRD   |= (1 << 6);
+  PORTD  &= ~(1 << 6);
+  g_ncoff = true;
+}
+
+/****************************************************************************
+ * Name: up_ledon
+ ****************************************************************************/
+
+void up_ledon(int led)
+{
+ /*                         ON      OFF
+  * LED_STARTED        0    OFF     ON  (never happens)
+  * LED_HEAPALLOCATE   0    OFF     ON  (never happens)
+  * LED_IRQSENABLED    0    OFF     ON  (never happens)
+  * LED_STACKCREATED   1    ON      ON  (never happens)
+  * LED_INIRQ          2    OFF     NC  (momentary)
+  * LED_SIGNAL         2    OFF     NC  (momentary)
+  * LED_ASSERTION      2    OFF     NC  (momentary)
+  * LED_PANIC          0    OFF     ON  (1Hz flashing)
+  */
+
+  switch (led)
+    {
+    case 0:
+      /* The steady state is OFF */
+
+      g_ncoff = true;
+
+    case 2:
+      /* Turn the LED off */
+
+      PORTD &= ~(1 << 6);
+      break;
+
+    case 1:
+      /* The steady state is ON */
+
+      PORTD |= (1 << 6);
+      g_ncoff = false;
+      break;
+
+    default:
+      return;
+    }
+}
+
+/****************************************************************************
+ * Name: up_ledoff
+ ****************************************************************************/
+
+void up_ledoff(int led)
+{
+ /*                         ON      OFF
+  * LED_STARTED        0    OFF     ON  (never happens)
+  * LED_HEAPALLOCATE   0    OFF     ON  (never happens)
+  * LED_IRQSENABLED    0    OFF     ON  (never happens)
+  * LED_STACKCREATED   1    ON      ON  (never happens)
+  * LED_INIRQ          2    OFF     NC  (momentary)
+  * LED_SIGNAL         2    OFF     NC  (momentary)
+  * LED_ASSERTION      2    OFF     NC  (momentary)
+  * LED_PANIC          0    OFF     ON  (1Hz flashing)
+  */
+
+  switch (led)
+    {
+    case 2:
+      /* If the "no-change" state is OFF, then turn the LED off */
+
+      if (g_ncoff)
+        {
+          PORTD &= ~(1 << 6);
+          break;
+        }
+
+      /* Otherwise, fall through to turn the LED ON */
+
+    case 0:
+    case 1:
+      /* Turn the LED on */
+
+      PORTD |= (1 << 6);
+      break;
+
+    default:
+      return;
+    }
+}
+
+#endif /* CONFIG_ARCH_LEDS */
diff --git a/nuttx/configs/teensy/src/up_spi.c b/nuttx/configs/teensy/src/up_spi.c
new file mode 100755
index 000000000..2ef0908f2
--- /dev/null
+++ b/nuttx/configs/teensy/src/up_spi.c
@@ -0,0 +1,202 @@
+/************************************************************************************
+ * configs/teensy/src/up_spi.c
+ * arch/arm/src/board/up_spi.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <debug.h>
+
+#include <nuttx/spi.h>
+#include <arch/board/board.h>
+#include <avr/io.h>
+
+#include "up_arch.h"
+#include "chip.h"
+#include "at90Usb_internal.h"
+#include "teensy_internal.h"
+
+#ifdef CONFIG_AVR_SPI
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+/* Teensy SPI Connection
+ *
+ * -- ---- -- ------------------------- -------
+ * J2 NAME PIN NAME                     PAD
+ * -- ---- -- ------------------------- -------
+ *  1 VIN  -- Connected to USB +RV
+ *  2 GND  -- Connected to USB GND
+ *  3 3V3  -- Not used                  ---
+ *  4 NC   -- Not used
+ *  5 CS   10 (SS/PCINT0) PB0           Pad B0
+ *  6 DI   12 (PDI/PCINT2/MOSI) PB2     Pad B2
+ *  7 SCK  11 (PCINT1/SCLK) PB1         Pad B1
+ *  8 DO   13 (PDO/PCINT3/MISO) PB3     Pad B3
+ *  9 IRQ  -- Not used                  ---
+ * 10 CD   14 (PCINT4/OC.2A) PB4        Pad B4
+ * 11 WP   15 (PCINT5/OC.1A) PB5        Pad B5
+ * -- ---- -- ------------------------- -------
+ */
+
+#define TEENSY_CS (1 << 0)
+#define TEENSY_CD (1 << 4)
+#define TEENSY_WP (1 << 5)
+
+/* The following enable debug output from this file (needs CONFIG_DEBUG too).
+ * 
+ * CONFIG_SPI_DEBUG - Define to enable basic SSP debug
+ * CONFIG_SPI_VERBOSE - Define to enable verbose SSP debug
+ */
+
+#ifdef CONFIG_SPI_DEBUG
+#  define sspdbg  lldbg
+#  ifdef CONFIG_SPI_VERBOSE
+#    define sspvdbg lldbg
+#  else
+#    define sspvdbg(x...)
+#  endif
+#else
+#  undef CONFIG_SPI_VERBOSE
+#  define sspdbg(x...)
+#  define sspvdbg(x...)
+#endif
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: at90usb_spiinitialize
+ *
+ * Description:
+ *   Called to configure SPI chip select GPIO pins for the LPC1766-STK.
+ *
+ ************************************************************************************/
+
+void weak_function at90usb_spiinitialize(void)
+{
+  /* The Teensy board has no dedicated SPI devices so we assume that SS is used
+   * for chip select:
+   *
+   *   "When the SPI is configured as a Master (MSTR in SPCR is set), the user
+   *    can determine the direction of the SS pin.  If SS is configured as an
+   *    output, the pin is a general output pin which does not affect the SPI
+   *    system. ...
+   *
+   *   "If SS is configured as an input, it must be held high to ensure Master
+   *    SPI operation. If the SS pin is driven low by peripheral circuitry when
+   *    the SPI is configured as a Master with the SS pin defined as an input,
+   *    the SPI system interprets this as another master selecting the SPI ...
+   */
+
+   DDRB  |= TEENSY_CS;                 /* B0 is an output */
+   PORTB |= TEENSY_CS;                 /* Low de-selects */
+   DDRB  &= ~(TEENSY_CD | TEENSY_WP);  /* B4 and B5 are inputs */
+   PORTB |= (TEENSY_CD | TEENSY_WP);   /* Pull high */
+}
+
+/************************************************************************************
+ * Name:  avr_spiselect and avr_spistatus
+ *
+ * Description:
+ *   The external functions, avr_spiselect and avr_spistatus  must be provided by
+ *   board-specific logic.  They are implementations of the select and status methods
+ *   of the SPI interface defined by struct spi_ops_s (see include/nuttx/spi.h). All
+ *   other methods (including up_spiinitialize()) are provided by common AVR logic.
+ *   To use this common SPI logic on your board:
+ *
+ *   1. Provide logic in avr_sspinitialize() to configure SPI chip select pins.
+ *   2. Provide avr_spiselect() and avr_spistatus() functions in your board-specific
+ *      logic.  These functions will perform chip selection and status operations
+ *      in the way your board is configured.
+ *   3. Add a calls to at90usb_spiinitialize() in your low level application
+ *      initialization logic
+ *   4. The handle returned by up_spiinitialize() may then be used to bind the
+ *      SPI driver to higher level logic (e.g., calling  mmcsd_spislotinitialize(),
+ *      for example, will bind the SPI driver to the SPI MMC/SD driver).
+ *
+ ************************************************************************************/
+
+void  avr_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
+{
+  sspdbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
+
+  /* Assert/de-assert the CS pin to the card */
+
+  if (selected)
+    {
+       PORTB &= ~TEENSY_CS;
+    }
+  else
+    {
+       PORTB |= TEENSY_CS;
+    }
+}
+
+uint8_t avr_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
+{
+  uint8_t ret = 0;
+  uint8_t regval = PINB;
+
+  /* Both the CD and WP pins are pull high by the AT90USB and will be
+   * grounded it a card is inserted or write protected.
+   */
+
+  if ((regval & TEENSY_CD) == 0)
+    {
+      ret |= SPI_STATUS_PRESENT;
+    }
+  
+  if ((regval & TEENSY_WP) == 0)
+    {
+      ret |= SPI_STATUS_WRPROTECTED;
+    }
+
+  sspdbg("Returning %02x\n", ret);
+  return ret;
+}
+
+#endif /* CONFIG_AVR_SPI */
diff --git a/nuttx/configs/teensy/src/up_usbstrg.c b/nuttx/configs/teensy/src/up_usbstrg.c
new file mode 100755
index 000000000..acc8cb071
--- /dev/null
+++ b/nuttx/configs/teensy/src/up_usbstrg.c
@@ -0,0 +1,137 @@
+/****************************************************************************
+ * configs/teensy/src/up_usbstrg.c
+ * arch/arm/src/board/up_usbstrg.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Configure and register the AVR MMC/SD SPI block driver.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/spi.h>
+#include <nuttx/mmcsd.h>
+
+#include "at90usb_internal.h"
+#include "teensy_internal.h"
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/* Configuration ************************************************************/
+
+#ifndef CONFIG_EXAMPLES_USBSTRG_DEVMINOR1
+#  define CONFIG_EXAMPLES_USBSTRG_DEVMINOR1 0
+#endif
+
+/* PORT and SLOT number probably depend on the board configuration */
+
+#ifdef CONFIG_ARCH_BOARD_TEENSY
+#  undef AVR_MMCSDSPIPORTNO
+#  define AVR_MMCSDSPIPORTNO 0
+#  undef AVR_MMCSDSLOTNO
+#  define AVR_MMCSDSLOTNO 0
+#else
+   /* Add configuration for new AVR boards here */
+#  error "Unrecognized AVR board"
+#endif
+
+/* Debug ********************************************************************/
+
+#ifdef CONFIG_CPP_HAVE_VARARGS
+#  ifdef CONFIG_DEBUG
+#    define message(...) lib_lowprintf(__VA_ARGS__)
+#    define msgflush()
+#  else
+#    define message(...) printf(__VA_ARGS__)
+#    define msgflush() fflush(stdout)
+#  endif
+#else
+#  ifdef CONFIG_DEBUG
+#    define message lib_lowprintf
+#    define msgflush()
+#  else
+#    define message printf
+#    define msgflush() fflush(stdout)
+#  endif
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: usbstrg_archinitialize
+ *
+ * Description:
+ *   Perform architecture specific initialization
+ *
+ ****************************************************************************/
+
+int usbstrg_archinitialize(void)
+{
+  FAR struct spi_dev_s *spi;
+  int ret;
+
+  /* Get the SPI port */
+
+  message("Initializing SPI port\n");
+
+  spi = up_spiinitialize(AVR_MMCSDSPIPORTNO);
+  if (!spi)
+    {
+      message("up_spiinitialize failed\n");
+      return -ENODEV;
+    }
+
+  /* Bind the SPI port to the slot */
+
+  message("Binding SPI port to MMC/SD slot\n");
+
+  ret = mmcsd_spislotinitialize(CONFIG_EXAMPLES_USBSTRG_DEVMINOR1, AVR_MMCSDSLOTNO, spi);
+  if (ret < 0)
+    {
+      message("mmcsd_spislotinitialize failed: %d\n", ret);
+      return ret;
+    }
+
+  return OK;
+}